F5 Turbo Circuit Boards - Page 200

WalterW · 16th March 2013, 10:51 PM

Warm is good.....hot is bad.

I'll just try.
If it's getting too hot, I will make an U-shaped profile for more cooling. Which also shields the transformers...hmmm nice...
must get some sleep now... thanks everybody.

omishra · 09:10 AM

I have built two discret bridges per channel using on semiconductor's mur3020wt diodes. They are slightly warmer side with bias of 0.6A/ device. Used small heatsink. As per datasheet it dissipates 1W for 2A forward current. Here diodes are conducting less than ampere per cycle, so dissipation is less than 0.4W / diode.

jacco vermeulen · 12:55 PM

Very wrong also.

At 50/60Hz mains, the caps are charged 100/120 times a second.
But each charge period does not last 1/100th or 1/120th of a second.

Charge current will only flow when charging voltage exceeds cap voltage level.
So only a tiny portion of the sinus slope is available for restocking the lytics.

If you calculate the ripple level for the smoothing cap number per rail and the bias level you have chosen, the lowest rail voltage level follows.

The sinus slope then tells at which point the diodes start conducting, from there till the sinus peak and back is the charging period.

Average charge current x charge period x 100 (or 120) ~ bias level (remember : VxI = VA ~ W = Joule per second)

For the MUR3020 : 1A x 0.6Vf x 1s < 10A x 0.92Vf x 0.1s

Zen Mod · 17th March 2013, 12:56 PM

it will be warm

WalterW · 17th March 2013, 01:02 PM

Quote:

Originally Posted by Zen Mod

it will be warm

jacco vermeulen · 17th March 2013, 01:05 PM

Quote:

Originally Posted by Zen Mod

it will be warm

Me idiot, when the sun shines and it's warm, I believe it's summer. (half the time)

WalterW · 17th March 2013, 01:57 PM

ah now I get it: 0,6 J/s is smaller then 0,92J/s

sts9fan · 25th March 2013, 10:45 PM

Soon?

Rixsta · 1st April 2013, 11:28 AM

haha Im waiting too, am patient though will hold of buying from elsewhere and build the rest for now.
Cheers!

nrg2009 · 1st April 2013, 01:23 PM

I hope very very soon..
the DIYAUDIO ways are mysterious,
but the end result is always fabulous!

:-) Happy Easter!

16th March 2013, 10:51 PM	#1991
WalterW diyAudio Member Join Date: Oct 2012 Location: Utrecht	Warm is good.....hot is bad. I'll just try. If it's getting too hot, I will make an U-shaped profile for more cooling. Which also shields the transformers...hmmm nice... must get some sleep now... thanks everybody. __________________ half Swiss, half Dutchie....

17th March 2013, 09:07 AM	#1992
omishra diyAudio Member Join Date: Nov 2008 Location: PNQ, MH	I have built two discret bridges per channel using on semiconductor's mur3020wt diodes. They are slightly warmer side with bias of 0.6A/ device. Used small heatsink. As per datasheet it dissipates 1W for 2A forward current. Here diodes are conducting less than ampere per cycle, so dissipation is less than 0.4W / diode. Last edited by omishra; 17th March 2013 at 09:10 AM.

17th March 2013, 12:51 PM	#1993
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	Very wrong also. At 50/60Hz mains, the caps are charged 100/120 times a second. But each charge period does not last 1/100th or 1/120th of a second. Charge current will only flow when charging voltage exceeds cap voltage level. So only a tiny portion of the sinus slope is available for restocking the lytics. If you calculate the ripple level for the smoothing cap number per rail and the bias level you have chosen, the lowest rail voltage level follows. The sinus slope then tells at which point the diodes start conducting, from there till the sinus peak and back is the charging period. Average charge current x charge period x 100 (or 120) ~ bias level (remember : VxI = VA ~ W = Joule per second) For the MUR3020 : 1A x 0.6Vf x 1s < 10A x 0.92Vf x 0.1s __________________ Not so much,.......if it says "ZM" in the corner. Last edited by jacco vermeulen; 17th March 2013 at 12:55 PM.

17th March 2013, 12:56 PM	#1994
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	it will be warm __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

17th March 2013, 01:57 PM	#1997
WalterW diyAudio Member Join Date: Oct 2012 Location: Utrecht	ah now I get it: 0,6 J/s is smaller then 0,92J/s __________________ half Swiss, half Dutchie....


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25th March 2013, 10:45 PM	#1998
sts9fan diyAudio Member Join Date: Apr 2006 Location: MA	Soon?

1st April 2013, 11:28 AM	#1999
Rixsta diyAudio Member Join Date: Feb 2004 Location: Barrow-In-Furness, Cumbria	haha Im waiting too, am patient though will hold of buying from elsewhere and build the rest for now. Cheers! __________________ www.Rixsta.co.uk Free music recorded by me/DIY pics+ebay-shop, amps=Zen V4, Zen-lightenment‎, Jean Hiraga 20w, F5

1st April 2013, 01:23 PM	#2000
nrg2009 diyAudio Member Join Date: Apr 2009 Location: Detroit, born and raised in the netherlands.	I hope very very soon.. the DIYAUDIO ways are mysterious, but the end result is always fabulous! :-) Happy Easter!

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